Novel catalysts for solar fuels

Lead Research Organisation: Heriot-Watt University
Department Name: Sch of Engineering and Physical Science

Abstract

This is a PhD research project in Chemical Engineering. Solar fuels produced from the photocatalytic conversion of CO2 using H2O is a means of addressing global energy demands without contributing to existing net CO2 emissions. However, since CO2 is very stable, its conversion to carbon based fuels requires substantial input of energy. The challenge here is improving conversion efficiency to make the process economically viable and this has led to extensive research on the development of highly efficient photocatalysts and scalable reactor designs capable of effective photon utilization for catalyst activation.This project applies novel multidisciplinary approaches to photocatalysis. The research will focus of the photo-catalytic behaviour of nanostructured visible light photocatalysts over supports with promising optical and electronic properties.

Planned Impact

Catalysis is an inherently transformative field and the single most powerful method to reduce cost, energy demand and ensure sustainable fine and commodity chemical manufacture. On a grander scale, we will advance the UK economy, security and health through the development and understanding of catalysis. Through an intensive training programme we will ensure optimal use and recovery of our critical resources, exploit new long-term sustainable resources and feedstocks and will make chemical manufacture fit for future generations. Above all we will develop technologies offering a step-change in resource management and utilization. Specific impacts include:
Industry: The UK is an emerging leader in chemical sustainability. Critical Resource Catalysis is thus inherent to the growth of a technology-driven UK economy. In 2007, the growing chemical industry supported 6 million jobs and 21% of the UK GDP. World-class academic researchers, a broadly educated PhD cohort, inherent industrial collaboration and a holistic training environment will deliver unique individuals and scientific outputs for the chemical industry and beyond. Over 95% of our PhD students have continued their scientific efforts, sharing expertise in postdoctoral and industry positions: we produce exceptionally valued workers. The enhanced training provision provided by this CDT ensures even greater demand. Our training is intrinsically linked to industry and private sector parties, delivering core scientific knowledge and translational skills. With expertise in delivering critical innovations to industry, CRITICAT will become the hub for business and industry collaboration, consultation and discovery in the UK and beyond.
Policymakers: Global governments are recognising how important resources are to quality of life. The UK is committed to policies that demand the development of new technologies to facilitate a sustainable lifestyle, including the decarbonisation of energy supplies and the recycling of products, in particular those which contain a critical resource. With a cohort versed in the scientific and sociological arguments surrounding these issues further equipped to tackle future scientific challenges we will supports and strengthens the policies set out by the UK government and will serve as a champion for clear policy direction in the future.
Public: Educating not only our cohort but the general public about the importance of Critical Resource Catalysis is essential. We will engage with beneficiaries, from general audiences to UK HEIs, on our finite resources, their economic impacts and the societal benefits of a sustainable chemical industry. Public science demonstrations, focusing on the chemistry and engineering of critical resources, their uses in today's leading technologies, and the exploitation of the catalytic chemical sciences in a sustainable lifestyle will be led by the cohort to provide the public with a balanced and reasoned view of our contributions. With extensive expertise in public engagement, our team of educators and leaders will drive engagement activities forward and train our cohorts to develop as broad-skilled champions of chemistry and catalysis.
Dynamic researchers: This CDT will deliver at least 80 newly qualified PhD scientists and engineers who are trained in catalysis, the key driver behind sustainable chemical technologies. The students will undertake an exceptionally broad training regime enhanced well beyond a traditional PhD programme. Combined with state-of-the-art research projects, the collaborative interactions intrinsic throughout the CDT will yield great foundational and transferable skills for both researchers and institutions. They will learn business, managerial and communication skills from bespoke training, collaborative science and industry placements. Long-term impact will be ensured through our cohorts' entry into the global workforce and our universities commitment to improved collaboration and pedagogy.

Publications

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Description As a result of the research that has been conducted so far the main discoveries and achievements will be mentioned below.
Firstly, significant photo-catalyst improvement was achieved by modifying its morphology. The photo-catalyst investigated in this research is titania based, mainly Titanium dioxide (TiO2), which is one of the most popular photo-catalyst for solar fuel applications. In this research TiO2 was successfully grown onto Fluorine-Tin Oxide (FTO) glass slides, in other words, conductive glass. The material was grown as a thin film, but more importantly it was grown as hyper-branched nanorods, with a tree-like structure where it drastically increases surface area and exposes active sites, but also improves light penetration and light scattering capability which are very important attributes towards an efficient photo-catalyst.
Furthermore, the TiO2 morphology was decorated and doped with Ru4+ nanoparticles, which increased the visible light wavelengths absorption of the photo-catalyst and allowed the catalyst to perform catalysis with a solar-simulator light source instead of a UV light source which are commonly the wavelengths that pure TiO2 can absorb.
Additionally, the fabricated Ru-TiO2 hyper-branched nanorods (HBNs) where used to photo-catalyse the reaction of epoxides and CO2 into cyclic carbonates. Cyclic carbonates are used as an electrolyte in Lithium-ion batteries. This reaction was reported to be photo-catalysed only twice in the literature, and one of them is the product of the current research. Therefore, a new field to be explored in the following years of this project lies ahead.
Furthermore, the material was used in a carbon dioxide (CO2) photoreduction reaction and it was shown that it can catalyse the reaction with good production rates and selectivity towards carbon monoxide (CO). Further research is being currently made but at the current stage no publication was made.
Exploitation Route The outcomes of this research project are valuable for anyone looking to improve the performance of a photo-catalyst and exhibits ways that synthesis, morphology and foreign material loading can modify a photo-catalyst to perform better in a specific application. The ability to fine-tune materials structure in the nano-scale and its impact on the applied reaction is also valuable and can be applied to a plethora of photo-catalysts. Additionally, the discovery of a reaction that can now be photo-catalysed opens a new field vastly unexplored that would definitely require more research and has great potential for improvement.
Furthermore, the studied material could also be used to produce the one component required for the production of syn-gas (synthesis gas) which is composed from H2 + CO. Thus, the current research has potential applications to the solar fuels sector.
Sectors Chemicals,Creative Economy,Education,Energy,Environment,Other